The Evolution of Forces by Gustave Le Bon

Author:Gustave Le Bon [Bon, Gustave Le]
Language: eng
Format: epub
Tags: Science / Alternative
Published: 0101-01-01T00:00:00+00:00

Fig. 14.—Proportion of visible and invisible radiations in a normal Solar Spectrum. The great dark hand on the left represents the invisible infra-red region. It extends, according to the latest measurements, up to rather more than 5 µ. The little white hand represents the visible portion of the spectrum. It is about 1/12th of the foregoing. The still smaller dark hand to the right represents the invisible ultra-violet region.

According to the last measurements of Langley, the visible solar spectrum only contains one-fifth part of the calorific energy of the infra-red region. The invisible region of the spectrum constitutes, then, the most important portion of light. It is only the sensitiveness of the human eye which creates the division between the visible and the invisible parts of the spectrum. It is not, doubtless, the same with all animals.

This immense invisible region of the spectrum, wherein is found the greatest part of its energy, ought to play a very important, though hardly suspected, part in the phenomena of vegetable life and in meteorology. We as yet know none of its properties except the calorific action. Its variations probably have considerable effect in the changes of the seasons. Langley has recognised that the solar spectrum changes at the different periods of the year, and that the distribution of its energy is not the same at different seasons.

The one-fifth of the solar radiation which appears under the form of visible light seems at first a very small proportion of the whole. It is in reality very great if we compare it with that of artificial light.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.